This model is a new product developed specifically for the automotive seat cushion industry. A comprehensive feeding double needle thick material flat sewing machine using a separated needle bar device. Two needle bars can work simultaneously or independently as needed, making sewing corners more convenient and stitching clearer. The upper and lower shafts are supported by ball bearings, driven by synchronous toothed belts, and automatically lubricated by a plunger type oil pump. Due to the comprehensive feeding mode, it is especially suitable for sewing thick multi-layer materials, such as leather, foam plastic, chemical fiber and other different materials, without slippage and dislocation. It is a high-end equipment for sewing car seat cushions, car clothing accessories, leather or synthetic leather shoe uppers, sports equipment, office furniture, soft cushions, bags and similar items. The FF20528D model adopts digital circuit control and has functions such as automatic wire cutting, automatic needle positioning, and automatic needle counting. Equipped with electronic servo motors, the performance is stable and the operating efficiency is extremely high.